never mind, saving and quitting got me back to the middle of the room safely!
there's definitely some kinda one-way wall in the corner of that alcove though, I got stuck again as soon as I went back there
There's an invisible wall around the whole level and it clips into the cave slightly unfortunatley... Will fix if I have the energy to make an update. But yeah, you can save and quit in any room and you'll be in that room's centre when you reload (which I added just in case this very thing happened)